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1 <br />' 22 May 2003 <br /> . AGE-NC Project No 97-0333 <br />' Page 4of5 <br />' Thereafter,ground water was evacuated(purged)from the bottom of each monitoring well screened <br /> interval until ground water was visually sediment free by lowering and raising(surging) a 3/8-inch <br /> outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the <br />' water-charged screened section, a Watera-Hydro-Lift R pump equipped with a mechanical arm was <br /> utilized to surge the polyethylene hose Approximately 125 to 15 gallons of water were purged from <br /> the multi-level monitoring wells during development Temperature,pH and conductivity of purged <br />' ground water were measured at regular intervals utilizing an Oakton water analyzer Purged ground <br /> water was containerized at the site in properly labeled DOT-approved model 17H 55-gallon drums <br /> Copies of monitoring well field Iogs for development activities are in Appendix C <br /> I <br /> 2 6 WELL ELEVATION SURVEY <br /> IOn 31 March 2003, a state of California state-licensed survey engineer from Baumbach &Piazza <br /> Engineering, Inc surveyed a reference point on the top of the well casing of wells MW-7 through <br /> MW-12 to the nearest 0 01-foot relative to known San Joaquin County Bench Mark ZAA-13 4, <br /> located near the site The results of the monitoring well survey are contained in Table 1 The <br /> Isurveying report (Baumbach & Piazza Job No 9797) is presented in Appendix D <br /> 3.0. SUMMARY AND CONCLUSIONS <br /> The results of the January, February and March 2003 multi-level well installation are as follows <br /> IAGE installed, developed and surveyed seven multi-level wells (MW-7 through MW-12), <br /> six of the seven CMT chambers were utilized to install screen intervals at depths of between <br /> 15 and 25 feet bsg (Hydrologic Unit 1), 40 and 45 feet bsg (Hydrologic Unit 2), 70 and <br /> 75 feet bsg (Hydrologic Unit 3), 95 and 100 feet bsg(Hydrologic Unit 4), 120 and 125 feet <br /> bsg (Hydrologic Unit 5) and between 145 and 150 feet bsg (Hydrologic Unit d) <br /> No soil samples were collected during multi-level well installations due to the potential for <br /> upward heaving sands that AGE previously encountered during construction of multi-level <br /> wells for the adjacent Flag City Chevron site (6421 Capitol Avenue, Lodi CA) Cross <br /> Isectional views D-D' and G-G' were generated from previous investigations and depict <br /> general lithology beneath the site (Figures 3 and 4) Generally, permeable, fine to medium <br /> sands were encountered beneath the site at depths between 37 and 46 feet bsg,60 and 76 feet <br /> bsg,94 and 105 feet bsg, 115 feet and 120 feet bsg and 135 to 148 feet bsg Less permeable, <br /> stiff fine grained, clays and silts were encountered at depths between 25 and 30 feet bsg, <br /> I 55 and 60 feet bsg, 85 and 90 feet bsg, 105 and i 10 feet bsg and between 125 feet and <br /> 135 feet bsg Variable lithology,including silty fine sands and sandy silts were encountered <br /> . at all other depths <br /> Advanced GeoEnvironmeniai,Inc <br />